Metal roofing costs $9.50 to $25 per square ... A protective blue-green patina slowly covers the shiny metallic color of natural copper as it ages and weathers. This process doesn’t harm the ...

Mathew explains that you need to be careful is the copper you're using hasn't been pre-patinaed, as "the metal can give off a metallic penny-like odor that can be unpleasant." Apart from that ...